Precise Rectangular Gage Block Sets 81 Piece Set Each block is steel and hardened to 65RC, stress relieved, lapped to accurate size, parallelism & flatness, then carefully inspected and marked for size designed to meet close tolerance. Each set includes standard sizes found in more expensive sets. Each block individually serialized and conforms to the rigid standards of the National Bureau Of Standards. Grade "B" tolerance = ±.000050". Grade 2 tolerances = 4, -2 millionths. Grade 3 tolerances = +8, -4 millionths.   Qty. Product # Description Price 100-810 Grade "B" ±.000050" 81 PC Set $69.95 SGB-812 Grade "2" +4 -2 Millionths 81 PC Set $275.00 SGB-813 Grade "3" +8 -4 Millionths 81 PC Set $169.95

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